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Craig Niederberger

Publications and source records attributed to Craig Niederberger.

At least 19 recordsLinked to original sources
PubMed2006

Multi-institutional validation of vasectomy reversal predictor.

PURPOSE: Some urologists who perform vasectomy reversals are not experienced with performing VE. A model to preoperatively identify patients who may require referral to an experienced VE surgeon was created (). We tested the model at multiple institutions. MATERIALS AND METHODS: The model had previously been designed in 483 patients who underwent vasectomy reversal at 1 institution (100% sensitive and 59% specific for predicting the need for VE). It was based on time since vasectomy and patient age. We tested it prospectively in 33 patients and retrospectively in a total of 312 at 6 other institutions. The predictive accuracy of the model was compared to using a simple duration from vasectomy cutoff alone, as is used in clinical practice. RESULTS: The model had 84% sensitivity and 58% specificity for detecting the need for VE in a total of 345 patients at 7 institutions. If using only a duration from vasectomy cutoff of 10 years to predict the need for VE, sensitivity was only 69%. At a cutoff of 4 years sensitivity was 99% but specificity was only 23%. Thus, the model performed better than any specific duration cutoff alone. CONCLUSIONS: The predictive model provides 84% sensitivity for detecting patients who may require VE during vasectomy reversal across 7 institutions (58% specificity). The model more accurately predicts the need for VE than using a specific duration from vasectomy cutoff alone.

Adult↗
PubMed2005

Effect of cryptorchidism and retractile testes on male factor infertility: a multicenter, retrospective, chart review.

This multicenter retrospective chart review study performed on 162 cryptorchid patients and on 34 subjects with retractile testes suggests that cryptorchidism and retractile testes can alter spermatogenesis, with more serious damage observed in bilateral cryptorchidism. This spermatogenetic impairment is probably related to the lack of an appropriate or timely surgical correction.

Adult↗